Add Workflows/Linux/Fedora Workstation/Install Flatpak.md

Workflows/Linux/Fedora Workstation/Install Flatpak.md

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+## Purpose
+You may need to install flatpak packages like Signal in your workstation environment.  If you need to do this, you only need to run a few commands.
+
+```sh
+# Usually already installed
+sudo dnf install flatpak 
+
+# Add Flathub Repo
+flatpak --user remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo 
+
+# Install Signal
+flatpak install flathub org.signal.Signal
+```